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feat: multiple lights kinda shadow support (shader is missing)

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This commit is contained in:
Amir Adal
2025-10-14 20:55:24 +02:00
parent fdbf1296de
commit 94afd17d65
9 changed files with 104 additions and 206 deletions
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116
src/renderer/renderer.cpp
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@ -59,12 +59,17 @@ void Renderer::ApplyLights(entt::registry& registry, Shader &shader) {
shader.setInt("lightsCount", static_cast<int>(lights.size()));
size_t lightIndex = 0;
for (auto entity : lights) {
auto &comp = registry.get<light>(entity);
auto &l = registry.get<light>(entity);
auto &transf = registry.get<transform>(entity);
shader.setInt("lights[" + std::to_string(lightIndex) + "].type", static_cast<int>(l.type));
shader.setVec3("lights[" + std::to_string(lightIndex) + "].position", transf.position);
shader.setVec3("lights[" + std::to_string(lightIndex) + "].color", comp.color);
shader.setFloat("lights[" + std::to_string(lightIndex) + "].intensity", comp.intensity);
shader.setVec3("lights[" + std::to_string(lightIndex) + "].color", l.color);
shader.setFloat("lights[" + std::to_string(lightIndex) + "].intensity", l.intensity);
shader.setMat4("lights[" + std::to_string(lightIndex) + "].lightSpace", l.lightSpace);
shader.setInt("lights[" + std::to_string(lightIndex) + "].shadowMap", 10 + lightIndex);
glActiveTexture(GL_TEXTURE10 + lightIndex);
glBindTexture(GL_TEXTURE_2D, l.shadowMap);
++lightIndex;
}
@ -115,81 +120,78 @@ void Renderer::GenerateShadowMaps(entt::registry& registry) {
const unsigned int SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
m_depthShader.use();
ApplyLights(registry, m_depthShader);
UpdateView(registry, m_depthShader);
glGenFramebuffers(1, &m_depth_fbo);
glGenTextures(1, &m_depthMap);
glBindTexture(GL_TEXTURE_2D, m_depthMap);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24,
SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
auto lights = registry.view<light>();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
for (auto [lEntt, l] : lights.each()) {
// TODO: support other light types when ready
if (l.type != light::LightType::DIRECTIONAL) return;
float borderColor[] = {1.0f, 1.0f, 1.0f, 1.0f};
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
glGenFramebuffers(1, &l.fbo);
glGenTextures(1, &l.shadowMap);
glBindTexture(GL_TEXTURE_2D, l.shadowMap);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24,
SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glBindFramebuffer(GL_FRAMEBUFFER, m_depth_fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_depthMap, 0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
float borderColor[] = {1.0f, 1.0f, 1.0f, 1.0f};
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
glBindFramebuffer(GL_FRAMEBUFFER, l.fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, l.shadowMap, 0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
}
void Renderer::Render(entt::registry& registry) {
const unsigned int SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
auto shadowLight = registry.view<light, transform>().back();
auto &comp = registry.get<transform>(shadowLight);
float near_plane = 0.1f, far_plane = 50.0f;
glm::vec3 lightPos = comp.position;
glm::vec3 target = glm::vec3(0.0f, 0.5f, 0.0f);
glm::mat4 lightView = glm::lookAt(lightPos, target, glm::vec3(0.0f, 1.0f, 0.0f));
glm::mat4 lightProjection = glm::ortho(-6.0f, 6.0f, -6.0f, 6.0f, 1.0f, 20.0f);
glm::mat4 lightSpaceMatrix = lightProjection * lightView;
m_depthShader.use();
m_depthShader.setMat4("u_lightSpace", lightSpaceMatrix);
// glEnable(GL_CULL_FACE);
// glCullFace(GL_FRONT); // only for the depth pass
// glEnable(GL_POLYGON_OFFSET_FILL);
// glPolygonOffset(2.0f, 4.0f);
auto lights = registry.view<light, transform>();
glCullFace(GL_FRONT);
glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
glBindFramebuffer(GL_FRAMEBUFFER, m_depth_fbo);
glClear(GL_DEPTH_BUFFER_BIT);
RenderScene(registry, m_depthShader);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glCullFace(GL_BACK);
for (auto [lEntt, l, t] : lights.each()) {
// TODO: support other light types when ready
if (l.type != light::LightType::DIRECTIONAL) return;
// glEnable(GL_CULL_FACE);
// glCullFace(GL_BACK); // only for the depth pass
// glDisable(GL_POLYGON_OFFSET_FILL);
// glPolygonOffset(0.f, 1.f);
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
float near_plane = 0.1f, far_plane = 50.0f;
glm::vec3 target = glm::vec3(0.0f, 0.5f, 0.0f);
glm::mat4 lightView = glm::lookAt(t.position, target, glm::vec3(0.0f, 1.0f, 0.0f));
glm::mat4 lightProjection = glm::ortho(-6.0f, 6.0f, -6.0f, 6.0f, 1.0f, 20.0f);
glm::mat4 lightSpaceMatrix = lightProjection * lightView;
m_depthShader.setMat4("u_lightSpace", lightSpaceMatrix);
l.lightSpace = lightSpaceMatrix;
glCullFace(GL_FRONT);
glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
glBindFramebuffer(GL_FRAMEBUFFER, l.fbo);
glClear(GL_DEPTH_BUFFER_BIT);
RenderScene(registry, m_depthShader);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glCullFace(GL_BACK);
}
// actual rendering
glViewport(0, 0, Window::GetWidth(), Window::GetHeight());
glClearColor(0x18/255.0f, 0x18/255.0f, 0x18/255.0f, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
m_shader.use();
m_shader.setInt("shadowMap", 31);
ApplyLights(registry, m_shader);
UpdateView(registry, m_shader);
m_shader.setMat4("u_lightSpace", lightSpaceMatrix);
glActiveTexture(GL_TEXTURE31);
glBindTexture(GL_TEXTURE_2D, m_depthMap);
RenderScene(registry, m_shader);
}